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Atomic fluorescence occurs when atoms in the gas phase absorb energy and re-emit it as light. The emission can follow several pathways, depending on the energy states involved. The primary pathways for atomic fluorescence include direct excitation fluorescence, resonance fluorescence, and secondary or cascade fluorescence. In direct excitation, atoms absorb photons from an _____ _______ _________ _________ ________ ________ __________ ___ __________ ________.
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